I guess this is why nanny cams were invented. A Staten Island mom suspected something was up with her babysitter and had a hidden camera installed in her carbon monoxide detector. She said she was going to the store one afternoon in late January, but really, she went to a nearby location to watch the nanny cam feed. Shortly after she left, the nanny gave the 5-month-old baby a bottle, then began hitting it across the face and shaking the infant when it refused to be fed.

The mother then rushed home and called the police.

Their nanny, a 52-year-old Uzbekistan-native, put up a fight the next day when the cops showed up, but was ultimately arrested. She's been charged with endangering the welfare of a child and resisting arrest -- she's currently being held in jail.

Even though this story is horrifying, it serves as a good reminder to follow your instincts. This mom knew something was up and wasn't shy about installing a hidden camera and getting the sad evidence she needed so that the nanny could pay for her crimes.

Granted, I don't know why the mom didn't just fire the woman the second she thought there was anything wrong, but I imagine she had a good reason to take the nanny-cam route.

Regardless, there's a happy ending. The kids are now safe and the nanny is behind bars ... all thanks to a mother's intuition.